Below are three websites that can be helpful in praying for different countries, and the persecuted church, around the world.

Prayercast has information to help you pray for different countries around the world. It gives a quick overview, including a short video, about each country.

Stratus has information about countries around the word. The focus is on where missions may be needed most, what some of the challenges would be in sharing the Gospel there, and it lists ways you can be praying for those places. You can dig in for more detailed info or just get a quick high level view.