There are 10 Interesting Islands in here. Islands can be barren atolls or lush mountainous islands, perhaps with active volcanoes. They might have castaways, native villages, giant apes, or even a shipwrecked family living in a treehouse. And, of course, pirates.
Then there are 10 Arcane Altars. They're great for placing when you're designing dungeons, temples, etc., as well as detailing existing encounters. What happens if the good cleric touches the altar? How about the evil one?
Next we come to 10 Flowing Fountains. Fountains are everywhere, from the deepest dungeons to city parks, from castle courtyards to town squares. They all need descriptions, and some of them need magic effects as well. This provides both.
After that, there are 10 Fantastic Fungi. Far beyond the normal mushroom, fungi can be really weird. Ones that are six feet tall and green with purple spots are even weirder. If you need just a mushroom or two, or you need to stock a whole underground cavern, you'll find plenty ready to use in this collection.