water hole

pit filled with water, large puddle of rainwater

In SETI, the Water Hole is the band of radio frequencies between 1420 MHz and 1640 MHz. This is the band between the hydrogen line and the strongest hydroxyl spectral line, and is notable because it is a quiet region between two notable frequencies; it is theorized that this would be a good band for communications to or from extraterrestrial intelligences.
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Noun
1. a natural hole or hollow containing water
(hypernym) pond, pool

Synonyms and related words:
artificial lake, bayou lake, cistern, dam, dead water, dike, etang, farm pond, fishpond, freshwater lake, glacial lake, inland sea, lagoon, laguna, lake, lakelet, landlocked water, linn, loch, lough, mere, millpond, millpool, nyanza, oxbow lake, plash, pond, pondlet, pool, puddle, reservoir, salina, salt pond, stagnant water, standing water, still water, sump, tank, tarn, tidal pond, volcanic lake, water pocket, well
  

water-hole /'wɔ:təhoul/
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