Natural resources often provide fertile ground for corruption. Since a substantial number of partner countries in development cooperation are richly endowed with natural resources, these contexts pose a particular challenge for effective donor action. The risk of corruption cuts across natural resource sectors - from non-renewable resources such as oil, gas, minerals and metals, to renewable resources such as forests, fisheries and land. There are, however, important variations in the challenges presented by these sectors and the manner in which corruption in relation to them can be addressed.