The Bush administration has proposed keeping potentially oil-rich wetlands in Arctic Alaska off-limits to drilling because of their ecological sensitivity, a reversal of its earlier plan.

The Bureau of Land Management proposed a 10-year leasing moratorium for 430,000 acres of wetlands in the National Petroleum Reserve-Alaska. Environmentalists and local groups hailed the decision.

The area, the North Slope's biggest freshwater lake, is considered potentially rich in oil and gas as well as a critical habitat for migrating birds and caribou. Two years ago, the administration was poised to sell leases to energy companies seeking to drill. But a lawsuit by environmentalists and native groups forced the agency to revisit the plan in late 2006.

Extensive public comment, input from the local government and practical considerations contributed to the policy change, said Jim Ducker, an environmental program analyst for the BLM.

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