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Many parts of Colombia have entered the rainy season, a time of year when swollen rivers often break their banks in the Andean nation and mudslides destroy homes or block mountain roads.

Recent scientific evidence suggests that floods originating in the Himalayas are caused largely by landslides that temporarily block mountain rivers.

She knew that the wash led nowhere, that it was a blind alley, a cul-de-sac ending in a rock-strewn, unclimbable slope that was the base of Block Mountain.

In the African portion Ruwenzori is regarded by some geologists to be a block mountain or horst.

Yet, just before the final edits of this book were to go the publisher, all the pages relating to the Block Mountain incident were about to be pulled.