Synonym; 人造湖 is slightly more technical or formal, while 人工湖 is more common in everyday contexts.
Refers specifically to a reservoir for water storage; 人工湖 can be broader, including recreational or aesthetic lakes.
Standard kanji spelling; literally 'artificial lake'.
Irregular kanji usage; 人口 means 'population', so this spelling is a common mistake or variant.
Compound of 人工 (じんこう, 'artificial') and 湖 (こ, 'lake').