Protected area “Marten – Ryahovo”, Natura 2000 under the Directive on the Conservation of Natural Habitats and of Wild Flora and Fauna falls within the lands of the villages of Marten and Sandrovo, Ruse Municipality and the village of Ryahovo and the town of Slivo Pole, Slivo Pole Municipality, Ruse Region, with a total area of 1172.74 ha.
The following are subject to protection:
- Alluvial (floodplain) forests with Black Alder (Alnus glutinosa) and Mountain Ash,
- Natural eutrophic lakes with vegetation of the Magnopotamion or Hydrocharition type: eutrophic and mesotrophic (medium-rich and rich in organic matter) lakes with plants attached to the bottom with floating leaves or freely floating on the surface. They are found at low altitudes throughout Bulgaria, most often in the Danube Plain, the Thracian Lowland and along the Black Sea coast.
- Rivers with muddy banks with Chenopodion rubri (annual plants growing on muddy river banks in the lowlands in the second half of summer)
- Otter,
- Red-bellied toad and
- Common pond turtle.
