useless trivia: What Word Means: A Haiku That Is The First Link Of A Renga?

Questions

------------ is the world's largest producer of cork. The country has regulations protecting cork trees dating back to 1320. During the 1920s and 1930s, it became illegal to cut down the trees other than for essential thinning and removal of older non-producing trees.?

The only river that flows both north and south of the equator is the -------------. It crosses the equator twice.?

The only three countries in the world whose names begin with "Z" are Zambia, Ziare and ----------, all in Africa.?

Reykjavik, --------------- is likely the cleanest capital city in the world.?

The Oregon Trail (1840-1860), the route used during the westward migrations of the United States, started in ------------- and ended in Oregon and was about 2,000 miles long.?