The Casinu country is crossed between Cozmeni and the border of Harghita county (19.6 km) by National Road 11B (connecting Cozmeni - Casinu Nou - Satu Nou - Targu Secuiesc). It only touches Casinu Nou on this route. The 121G county road strings the Casinu villages along the line Casinu Nou-Plaiesii de Jos-Iacobeni. The area of the Casinu country is 308.1 km2, the number of its inhabitants was 3,143 on 1st January 1996.
The Casinu country is one of the smallest districts of Harghita county, one of the small tradiotionalist ethnographical regions of Seklerland. From administrative point of view it consists of one single community (to which four other villages: Casinu Nou, Plaiesii de Sus, Iacobeni and Imper belong). These villages were settled around the Csere Hill (801 m). The 'tinut' was constituted by Fels§falu, Imper, Iacobeni and Satu Nou in the 16-17th centuries. Then Plaiesii de Jos and Plaiesii de Sus were not independent administrative units. The community Casinu Mare shows the settlement structure with dead-end streets organised on family basis. This 'string of villages' has a great tradition. Its folk architecture is of especially high value.
The Casinu geographical name can be of Slavic origin: its meaning being 'sour stream, water' it refers to the mineral water springs. Besides the 152 'free Sekler' soldier families we can find only one landowner with 12 serf families settled around the mansion in Casinu at the beginning of the 17th century. The majority of the inhabitants has preserved their ancestral occupation: cattle-, sheep- and horse-breeding on the alpine pastures and meadows having been kept as common property. Selling the animal excess on the Ciuc and Trei Scaune trades used to be the main source of living.
The basin is open to the south, towards the Upper Trei Scaune Basin. It communicates with Lower Ciuc through the Nyerges Peak and with the Trotus Valley through the Aklos Pass. Its natural resources are the forests, natural meadows, clay-like material and mineral water springs. The nearest railway is to be found at Sanzieni (23 km), as well as at Tusnad.
Casinu is a separate ethnographical region, with colourful costumes, folk customs and folk trades. In Casinu they used to weave wool dyed red, greenish-yellow and blue. The ribboned headdress,the "Casinu chepes" belongs to the ancient national costume and it is still part of the elderly people's clothes. Shepherd carving, distaff- and linen drawer-making, gate carving, wooden grave-post and crucifix-making also used to be significant. The bull-hitting tradition connected with the last days of carnival time in Casinu Mare is of special interest.
The conditions for holidaymaking are not developed in Casinu country. Only transit and village tourism can be expected, the receptiveness is moderate. 0nly natural conditions are given for the creation of curative tourism. The already existing touristic supplies are suitable only for meeting local and hunting and excursion tourism requirements.