The gestation period of Amur tigers, the world's largest big cat, is between 103 to 110 days.

BBC: Highland Wildlife Park's rare Amur tigers mating

There were two new passengers on the bunks below who had got on in the middle of the night, somewhere west of Komsomolsk-on-Amur.

BBC: A train to nowhere in Siberia

The survivors floated down the Amur, wintered at the river's mouth and in the spring turned north into the Sea of Okhotsk.

ECONOMIST: The Amur River

By December Poyarkov had crossed the Stanovoi Range to the Amur watershed.

ECONOMIST: The Amur River

Across the Amur river in China, it is 140 times as much.

ECONOMIST: Russia does not exactly soar in its Asian backyard

In 1649 another Cossack adventurer, Yerofei Khabarov, came to the Amur.

ECONOMIST: The Amur River

These covered pensions, medication prices, the overhauling of entire industries and Russia's accession to the World Trade Organization, Amur tigers and hip-hop music, and everything in between.

CNN: Putin on retiring: 'Don't count on that'

All that remains unresolved is a small stretch along the Amur River near the Russian city of Khabarovsk, where three small river islands, no more than 12 sq km in total, are not yet covered by treaty.

CNN: ALLIANCES