There is a lake named Prokosko, only 60 km from Sarajevo, in the Vranica mountain. It's central Bosnia, heart of the country and old kingdom of Bosnia. Road is not so fine, but that explain why is this place preserved and so natural.
If you decide to visit it, be prepared for wild and beauty forest, with several streams before you reach the lake at the top.
Lake is with clear, drinking water, with a small village around it. Here is possible to eat some domestic food prepared on a traditional way. Altitude is 1.6 km so the appetite is just great. Meat pie is even better if you drink yogurt from the host pantry.
Hiking is possible in any direction, simply choose you way and enjoy variety of pure and unique environment. With enough luck, maybe it's possible to find some endemics of your own. Plant or insect named by you, you never know!