The area around the Chubut River, close to its mouth in the Northeast of the Chubut province, is called Comarca del Valle Inferior. From the Florentino Ameghino dam to the Port of Rawson, the river joins different places of interest: 28 de Julio, Dolavon, Gaiman, Trelew and Rawson and Playa Unión. This valley encompasses several natural, historic and cultural resources, which make a good supplement to the experiences at Península Valdés and Punta Tombo.

At 150 kilometres from the Atlantic Ocean, there is Dique Ameghino, a river dike mainly used for recreation by local communities. It has an internal villa where one may camp and enjoy adventure activities. Nearby, along the route from the mountains toward the sea, Dolavon is located. This is a small village in which the first flour mill of the region still operates, as a reminder of a time of abundant, excellent wheat harvests in the valley.

Between Dolavon and Gaiman, the latter a milestone of Welsh colonization, the Bryn Gwyn Paleontological Park is located. This park contains paleontological profiles of the marine Tertiary, a time in which the seas were warm and other fauna inhabited the land and the Southern oceans.

Continuing on the route westward, there is Gaiman, an ancient Welsh colony in which some of the settlers' traditions are conserved. In Gaiman there are some tea houses, and in its suburbs there are many chapels still in operation. The major city of the region is Trelew, with some 90,000 inhabitants. It is a commercial centre in a strategic location for land and air transportation. The Egidio Feruglio Paleontological Museum and other sites of historical interest are located in the city.

The Port of Rawson is located at the mouth of the Chubut river, bordering the city of Playa Unión. Here one can make recreational use of the beach, and in spring, take excursions to see the Commerson's Dolphins (Cephalorynchus commersonii).