Arctic Ocean gas reserves, and the Chukchi shelf forms the border between Russian and the United States as stated in the USSR–USA Maritime Boundary Agreement. The whole area is subject to international territorial claims. An underwater ridge, the Lomonosov Ridge, divides the deep sea North Polar Basin into two oceanic basins: the Eurasian Basin, which is between deep, and the Amerasian Basin (sometimes called the North American, or Hyperborean Basin), which is about deep. The bathymetry of the ocean bottom is marked by fault block ridges, abyssal plains, ocean deeps, and basins. The average depth of the Arctic Ocean is . The
Fridtjof Nansen was signed on 2 November 1907, and Nansen considered his task complete. Resisting the pleas of, among others, King Edward that he should remain in London, on 15 November Nansen resigned his post. A few weeks later, still in England as the king's guest at Sandringham, Nansen received word that Eva was seriously ill with pneumonia. On 8 December he set out for home, but before he reached Polhøgda he learned, from a telegram, that Eva had died. After a period of mourning, Nansen returned to London. He had been persuaded by his government to rescind his resignation until after