The Kamchatka peninsula.
The Kamchatka puninsula
Cape Dezhnev on the Chukchi Peninsula is in Siberia and is 30.2 miles from Little Diomede Island which is in Alaska. Little Diomede is 2.2 miles from Big Diomede Island which is Russian.
The Antarctic Peninsula is less than 700 miles from South America.
Kodiak was the original Capital of Russian America and then Sitka, 90 miles southwest of Juneau, became the capital of Russian America in 1808. The territorial capital was moved to Juneau in 1906.
Chile and Argentina -- at the southern tip of South America -- are about 500 miles from the Antarctic Peninsula.
It depends on which America: In North America, the MacKenzie in Canada (2,635 miles) follows the Missouri/Mississippi (3,870 miles). Then comes the Yukon in Alaska/Canada (1,920 miles) and then the Río Grande (1,900 miles) .
South America the closest continent to North America without "touching" it is Asia which is just 3 miles from a Russian island to an Alaskan island.
No continent connects to Antarctica. The closest continent is South America, which is about 600 miles away from the Antarctic Peninsula.
The Arabian Peninsula is 1,200 miles on the side bordering the Red Sea. It is 1,300 miles across at the widest point. The total area of the peninsula is about 1,200,000 square miles.
Arabian Peninsula - About 1 million square miles (including its offshore islands).
The Kenai Peninsula is 16,013 square miles in area.