The phrase "astounding variety" is correct and usable in written English.
You can use it to describe a remarkable or impressive range of different things, often in contexts like nature, products, or experiences.
Example: "The festival showcased an astounding variety of cuisines from around the world, each more delicious than the last."
Alternatives: "incredible diversity" or "remarkable range."
Insect ecology addresses an astounding variety of interactions between insects and their environment.
Josephson's research has turned up an astounding variety of dead ends.
An astounding variety of fish were sorted dockside into plastic trays.
His willingness to experiment and explore new directions enabled him to produce an astounding variety of visual designs.
On his surprising run to the quarterfinals at Wimbledon, Tomic displayed an astounding variety of spins, angles and slices.
Horned skulls, beaked skulls, armoured skulls: all the astounding variety of late Cretaceous megafauna is arrayed amid the shadows.
Do not overlook this opportunity to choose one of the many astounding varieties which might be most fun or useful for you.
But Ashkelon, with prompting by passionate experts and the amateurs they tutor, regularly disgorges an astounding number and variety of ancient artifacts: in recent years, a silver statuette of a calf, a dog cemetery, arrowheads, bi-chrome pottery, amphorae once filled with wine from Cyprus and Rhodes and silver coins bearing the portrait of Alexander the Great.
Once the match began, there were other things to see: the terrifying speed of Kyrgios's racquet head as it whipped through a forehand; the early nervousness written on the face of Bedene, a British player (by way of Slovenia), who was ranked No. 77; the astounding pace and variety of spins that Kyrgios was generating and that Bedene wasn't.
For a year, while attending to her other duties, she pored over plans and planting lists at the Olmsted Center in Queens, discovering not only the astounding number of varieties the city used, but also how big they were when planted.
The variety is astounding but not surprising.
