Pasi pemvura ine munyu inenge 361,000,000 km2 (139,000,000 sq mi) uye inowanzogoverwa mumakungwa makuru nemakungwa maduku, uye gungwa rinenge rinenge 71% yepasi uye 90% yepasi yepasi. Gungwa rine 97% yemvura yepasi, uye oceanographers vakataura kuti pasi pe5% yeGungwa reNyika yakaongororwa. Huwandu hwese hunenge 1.35 bhiriyoni cubic kilometers (320 mamiriyoni cubic mi) nehuwandu hwehupamhi hweanenge 3,700 metres (12,100 ft). Sezvo gungwa renyika iri chinhu chikuru cheHydrosphere yepasi, inoumba chikamu chehupenyu, uye inokanganisa mamiriro ekunze nemamiriro ekunze. Gungwa reNyika inzvimbo inozivikanwa yemarudzi mazana maviri nemakumi matatu ezviuru, asi nekuda kwekuti haina kuongororwa, huwandu hwemarudzi ari mugungwa riripo, pamwe anopfuura mamirioni maviri.
71%