The Grey Dune of Pāvilosta nature reserve covers 42 hectares of land and has been designated to protect Latvia’s widest dune (1.5 km parallel the seacoast, and 812m in the direction from the sea to inland) and the biotopes and species found there. A two-storied watching platform is built to savour the scenery.

 In Soviet time, local fishermen used to dry seaweed in dunes for production of agar, and thus rich vegetation developed in the dune. The Gray Dune is part of a unique landscape with the sea view, the traditional architecture of Pāvilosta fishing town, and biotopes, including protected, which border the nature reserve: pine forest, embryonic dunes, white dunes, and wet beech where once can find springs. Biotope 2130, “Fixed dunes with herbaceous vegetation (grey dunes)” is found here. At present, pines are taking over the biotope, therefore some maintenance activities are required. The Grey Dune is most beautiful in the second half of July and in August when the blossoming Breckland Thyme (Thymus serpyllum) and Narrowleaf Hawkweed (Hieracium umbellatum) colour the dune in shades of yellow and violet. The most typical species here are Pasqueflower (Pulsatilla pretense), Grey Hair-grass(Corynephorus canescens), Blue Hair Grass (Koeleria glauca), Sand Pink (Dianthus arenarius).

The Gray Dune earned wide recognition when a group of enthusiasts actively campaigned for six years to achieve the status of the nature reserve. Guna Grimsta, a group representative remembers that they organised events and activities throughout Latvia involving large part of the society, prominent personalities, church parishes, NGOs, school youth and university students. The activists were writing letters, making videos, doing research articles, composing music, collecting signatures and submitting proposals to achieve official status of the Grey Dune as an especially protected nature site. They organised seminars, concerts, art plenaires and exhibitions, educational excursions, joint-work, musical church services, meetings with high officials and their on-site visits to the Gray Dune.

In 2006 the group received the title „Proudness of Latvia” awarded by the national TV3 broadcasting company and daily paper „Diena”.
The nature reserve „Gray Dune of Pāvilosta” was established in October 30, 2007. It is the most recent Natura2000 site in Latvia.

Cena's heath swamp's trail was made to introduce vistors to one of the most beautiful things in nature - a moss swamp. The pathway goes not only around beautiful swamp lakes but also meets the degraded part of the swamp. At the beggining and the end is a watch tower.

This is a territory which regularly floods when the Lielupe River crosses its banks. These are flood-land meadows of importance to birds. The area can be surveyed from the Rīga-Liepāja highway and the Kalnciems road which runs along it.