Det område, hvor alt overfladevand strømmer til et sted. Oftest er stedet et hydrografisk objekt, for eksempel: en flod, en sø, et vådområde mv. Oplandet er den grundlæggende hydrografiske enhed.
Hver tomme af jord på Jorden er en del af et opland.
Kilde: http://www.catchmentguidelines.org.mw/en/catchment-management/what-catchment
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