Just a guess, I think I've heard this before in the context.

Did a little googling and thought about it. That's all.

Results 1 - 10 of about 19 for seesenke OR seesenken.
Results 1 - 10 of about 82,800 English pages for "lake beds"
e.g.:
Sedimentary rock on Mars suggests large, ancient lake beds
Scientists looking at satellite images of Mars have detected evidence of sedimentary
rocks dating back billions of years, suggesting that the planet once ...
www.cnn.com/2000/TECH/space/12/04/mars.ancient.lakes.02/ - 47k - Cached - Similar pages

Edwards Dry Lake Beds
The Dry Lake Beds. Edwards Air Force Base, on California's Mojave Desert about
100 miles northeast of Los Angeles, has two unique natural resources that ...
www.edwards.af.mil/history/docs_html/center/lakebeds.html - 11k - Cached - Similar pages

Erosion: Tecopa Lake Beds
... Pliocene and Holocene Tecopa Lake beds (below) contain several volcanic ash beds.
The youngest ash, within a few meters of the top of the lake beds, ...
mojave.usgs.gov/erosion-valjean/tecopa.html - 2k - Cached - Similar pages

Glacial lake plains
They were once lake beds; the ridges of gravel were beaches; the flat stratified
sand and gravel plains and clay plains with a veneer of sand or gravel were ...
www.geo.msu.edu/geo333/glacial-lakeplain.html - 6k - Cached - Similar pages

Acid-Neutralizing Capacity of Lake Beds
Acid Neutralizing Capacity of Lake Beds. Description: Pouring a weakly acid
solution containing an indicator through a column of limestone changes its color ...
genchem.chem.wisc.edu/demonstrations/Gen_Chem_Pages/15precippage/acid-neutralizing_lakebed.htm - 3k - Cached - Similar pages

HTH anyway, Tom

The geological term for "Senke" is "depression."

I would probably call it "lake depression."

Google hits: 714