Lakes of Bendakaluru

Satellite view: Esri, Maxar, Earthstar Geographics

Karabu Kere/Konappana Agrahara Lake

Also called Naganathapura kere, Karabu Kere

Kere, a large tank, in Naganathapura ward, Bengaluru South

See it on the map
Size
3.26 acresAbout 1.8 football pitches
Rank by size
1141st largestOf 1,621 lakes that still exist
Valley
Koramangala-Challaghatta
Who looks after it
BBMPBruhat Bengaluru Mahanagara Palike
Water quality
Fit only for wildlife and fishTested Jul 2026
Built over
4% of the lakeSatellite, 2021. The 2018 survey found 0.9% encroached.

Through the years

Nothing on record for 1981 to 1983.

The records listed below, drawn on one line from 1980 to 2026.

  1. 1980

    Not on the survey map

    See source

  2. 1984-2021

    Held water most years

    Water in 8% of all satellite passes, 1984-2024

    7% of its water area has since gone dry; 33% is new water

    4 years not counted: the satellite saw under half the lake

    Floating weed looks like dry land to this record, so a weed-covered year can read as dry

    See sourceSee source

  3. 2017-2018

    In the water bodies census, not marked as encroached

    This census's status marks are often wrong

    See source

  4. 2017-2025

    Mostly built on or bare from 2021

    About three in four of these readings are right, so trust what holds for several years

    See source

  5. 2018

    Still there in the 2018 lake survey

    0.9% encroached, polluted, 5.42 acres surveyed

    See source

  6. 2024

    On the state's list of Bengaluru lakes, looked after by BBMP

    See source

  7. 2025-2026

    Tested by the state board in 16 months, most often fit only for wildlife and fish

    Apr 2025 to Jul 2026

    See every testSee source

  8. 2025-2026

    Mostly floating weed after the monsoon; mostly open water in the dry season

    After monsoon, Oct 2025 to Dec 2025

    • 0% open water
    • 100% floating weed
    • 0% dry or built

    Dry season, Mar 2026 to May 2026

    • 96% open water
    • 0% floating weed
    • 4% dry or built
    See source

How big it is

The records disagree on its size, so each measure is shown.

Drawn outline
3.26 acres

About 1.8 football pitches

See source
Land records
5.42 acres

About 3.1 football pitches

See source
2018 lake survey
5.42 acres

About 3.1 football pitches

See source
End to end
190 m

The longest straight line across the outline

See source
Deepest point, 2018
2.5 m
See source
Kind of lake
Kere, a large tank
See source

How clean the water is

Latest test
Fit only for wildlife and fish

Fit only for wildlife and fisheries. Class D on the state board’s scale from A, the cleanest, to E.

Tested Jul 2026

See source
Class each month, tested 16 times since Apr 2025
Fit only for wildlife and fish: 12 months. Fit only for irrigation: 4 months. Every month is listed in the readings below.
Drinkable after disinfection
Fit for bathing
Drinkable after treatment
Fit only for wildlife and fish
Fit only for irrigation
See source
How it looked in 2018
Polluted
See source
What pollutes it, 2018

Sewage

See source
Sewage flows in, 2018

From the south

See source
Inlet and outlet tests, 2017-18
1 readings
See source
Every reading
Show every reading

Latest test, Jul 2026. Too low to measure: boron, carbonate, phenolphthalein alkalinity, kjeldahl nitrogen

MeasureUnitValue
Water temperature°C24
Dissolved oxygenmg/L5.2
pH6.9
ConductivityµS/cm915
BODmg/L6
Nitratemg/L as N4
Nitritemg/L as N0.28
Faecal coliformMPN/100mL940
Total coliformMPN/100mL2,200
Bicarbonatemg/L116
TurbidityNTU16.6
Total alkalinitymg/L as CaCO3116
Chloridemg/L192
CODmg/L64
Ammonia nitrogenmg/L as N0.4
Total hardnessmg/L as CaCO3152
Calcium hardnessmg/L as CaCO380
Calciummg/L32
Magnesium hardnessmg/L as CaCO372
Magnesiummg/L17.5
Sulphatemg/L37
Sodiummg/L82
Dissolved solidsmg/L624
Suspended solidsmg/L20
Phosphatemg/L0.24
Potassiummg/L5
Fluoridemg/L0.35
Sodium share%53
Sodium adsorption ratio2.89
Orthophosphatemg/L0.7

Every month the state board tested it

MonthClassDissolved oxygenmg/LBODmg/LFaecal coliformMPN/100mLTotal coliformMPN/100mLSource
Jul 2026D5.269402,200See source
Jun 2026D5.362,7007,900See source
May 2026D4.268404,300See source
Apr 2026E3.2126302,100See source
Mar 2026D4.864704,300See source
Feb 2026D5.4639920See source
Jan 2026E3181,7007,000See source
Dec 2025D6.344,3009,400See source
Nov 2025E3153104,300See source
Oct 2025E1.8183202,800See source
Sep 2025D5.941,7009,400See source
Aug 2025D5.953304,300See source
Jul 2025D5.862403,500See source
Jun 2025D6.144803,500See source
May 2025D4.693104,300See source
Apr 2025D5.855,80012,000See source

Inlet and outlet tests, 2017-18 lake survey

DateWhereWater temperature°CLight transparencycmpHConductivityµS/cmDissolved solidsmg/LSuspended solidsmg/LTurbidityNTUDissolved oxygenmg/LCODmg/LBODmg/LTotal phosphateKjeldahl nitrogenmg/L as NTotal coliformMPN/100mL
2018-02-0523.597.81,6991,0624233.69.1514411.592.256900
See source

How much is built over

Built inside the outline
4%

From satellite land cover, 2021

See source
Encroached area, 2017
0.17 acres

Reported by the state legislature’s committee on lake encroachment

See source
Encroached by

Central Jail and the public

See source
Taken for

Compound wall & houses

See source
Where it is encroached

On the north-west, south and south-east side

See source
Dumped in it

Garbage dump

See source
Land record maps
See source
Land within 500 m

67% built, 16% trees, 6% grass, 6% crops, 3% bare ground, 1% shrubs

From satellite land cover, 2021

See source

Who looks after it

Looked after by
Bruhat Bengaluru Mahanagara Palike

BBMP

See source
City work on the lake
To be developed
See source
City zone
Bommanahalli
See source
City lake page

Open its page on the city’s lake monitoring site

See source

Where its water comes from and goes

Valley
Koramangala-Challaghatta

The river basin its water drains to

See source
Overflows into

Doddakodlu

See source
Catchment
0.2 km²

The land that drains into it

See source
Fed by, 2018 survey

Rain & drain fed

See source
Built parts, 2018 survey

1 inlet drain, no overflow weirs, no sluice gates, no culverts, no check dams and no islands

See source

What lives here

Animals seen, 2018 survey

Birds, dragonflies and lizards

See source
Water plants, 2018 survey

Emergent and rooted floating

See source
Weed cover, 2018 survey

Partial

See source

Around it

Around it in 2018

Settlement & plantation

See source

Photos

No photos of it on Wikimedia Commons yet.

Where it is

Ward 33
Naganathapura

ನಾಗನಾಥಪುರ

Bengaluru South corporation, Bangalore South assembly seat

See source
Village
Naganathapura

Begur hobli, Bengaluru South taluk, Bengaluru Urban district

See source
Land survey numbers

81

See source
Height above sea level
917 m
See source
Coordinates

12.8785° N, 77.6687° E

See source

Read more

OpenStreetMap
See source
Its number in each record
ATREE lake map
145
2018 lake survey
BUBSBGngp_kr1-1481
Lake Development Authority
LDA380
KGIS tank map
963
Water bodies census
2/12/002/276600/1302863/003
City lake monitoring site
137