Rịba ama amaokwu a dị n'okpuru ma zaa ajụjụ ahụ mgbe e mesịrị n'otu asụsụ ahụ dị ka amaokwu ahụ:  Passage: Erhai dị mita 1,972 (6,470 ft) karịa oke osimiri. Na nha, ogologo North-South nke ọdọ mmiri ahụ bụ 40 kilomita (25 mi) na obosara East-West bụ ihe dịka 7<unk>8 kilomita (4.3<unk>5.0 mi). Mpaghara ya bụ square kilomita 250 (97 sq mi), na-eme ka ọ bụrụ ọdọ mmiri nke abụọ kachasị ukwuu na China, mgbe ọdọ mmiri Dianchi gasịrị. Okirikiri ya ruru kilomita 116 (72 mi), omimi ya bụ mita 11 (36 ft) na ikike nchekwa nke ijeri cubic mita 2.5 (2,000,000 acre⋅ft).  Ajụjụ: Olee otú ọdọ mmiri Erhai hà?
Ogologo ugwu-ndịda nke ọdọ mmiri ahụ bụ kilomita 40 (25 maịl) na obosara ọwụwa anyanwụ-ọdịda anyanwụ bụ ihe dịka 7<unk>8 kilomita (4.3<unk>5.0 maịl).