The gap's not large, and I expect you can only see it when you're directly opposite, at a right angle to the line of the high ground.

If you moved back a mile or two, the rocks and trees would shut it in.

Drummond didn't see it as we came up the lake." "I suppose we must wait until to-morrow ?" "Yes," said Thirlwell.

"We must leave the water, and can't get through the bush in the dark." Agatha made a sign of agreement.

"Very well; I am glad the nights are very short.