natural resource
From Longman Dictionary of Contemporary Englishnatural resourceˌnatural reˈsource / $ ˌ... ˈ../ noun [countable usually plural] things that exist in nature and can be used by people, for example oil, trees etc a country with abundant natural resourcesExamples from the Corpusnatural resource• A major project is under way to reintroduce the waterwheel and turbine in order to harness this great natural resource once again.• Water power is our country's most important natural resource.