There are a lot of interesting places in Africa ,( 否定句）说明原因

There are a lot of interesting places in Africa ,( 否定句）说明原因
There are a lot of interesting places in Africa ,( 否定句）
说明原因

There are a lot of interesting places in Africa ,( 否定句）说明原因
There are not many interesting places in Africa .(句中有be变否定句时直接在其后加not即可,另外,a lot of不能用于否定句,故要改为many)

There are no interesting places in Africa.

There aren't any interesting places in Africa.