水城 (Shuǐ chéng) is a proper noun meaning 'water town' or 'waterside town', referring to a town or city built around canals, rivers, or lakes — like Venice, Suzhou, or the ancient water towns near Shanghai (e.g. 周庄, 乌镇). It's a place name (p.w. = place word) and is used as a geographical label, not a general descriptive term. You'll encounter it in travel writing, tourism, and cultural descriptions.