Byala Reka Eco-trail – Kalofer – One of the most visited attractions in Kalofer is undoubtedly the Byala Reka eco-trail, constructed along Byala River (bg: Reka). The trail itself will offer you an incredible walk among the impressive natural beauty of the Central Balkan National Park. The trail is not too long and is suitable even for unprepared tourists, as it is only 1.83 km and has enough places to rest. The eco-trail starts northwest of Kalofer, just after you pass the Kalofer Male Monastery.