鹹湖 is read as かんこ (kanko) and means salt lake.
かんこ
kanko
かんすいこ
saltwater lake
みずうみ
lake
びわこ
Lake Biwa
みかづきこ
oxbow lake
ふじごこ
the Five Lakes of Mt. Fuji
ちかこ
underground lake
じんこうこ
artificial lake
かこうげんこ
crater lake
しぜんこ
natural lake
じんぞうこ
ゆうこうこ
exorheic lake
むこうこ
endorheic lake