The two rows of lanterns that led to the dais were wide enough apart that the four of them were able to walk side by side.
(C. Paolini; Inheritance)
Have I understood it right that I can say something like the following:
"It was deep enough under the water that nobody could reach it."
"This plane flies high enough above the ground that nobody can see it." etc.
Thanks.
Yes, I believe you have understood the usage.
John