Roto Mokoia (Lake Westmere) is a small coastal lake, immediately north of Whanganui. The lake covers an area of 8 hectares, has a maximum depth of 6 m and is surrounded by 20 hectares of bush tracks and farmland. The lake is known to have high levels of nutrients and E. coli and is thus not overly suitable for recreation (source lawa.co.nz).
