After the Hungarian–Romanian War of 1919 and the Treaty of Trianon of 1920, it became part of the Kingdom of Romania and fell within Ciuc County during the interwar period.

Borsec, a resort chiefly known for its mineral water and favourable climate, is situated in the intracarpatic depression of the same name, at an altitude of 900 m (3,000 ft).

The Borsec Depression has an oval shape and is northeast oriented, being separated from the hilltop of the Rotunda Chair in two subunits.

The latter is southwest along national road DN15 [ro] at its junction with county road DJ128 Borsec-Ditrău, and Borsec de Sus (or the resort itself) is located on the plateau located northeast of the primary settlement, which is at higher altitude on average with 80–100 m. In the west, at a short distance, one can reach Toplița, the Pass of Creangă and to the east the Bistricioara valley.

Borsec is a favorable place for rest and recreation: it is a real paradise for those who enjoy excursions (known destinations include Poiana Zânelor, the ice cave, the bears' cave, Izvorul Străvechi, Cetatea Bufnițelor), those who like winter sports (on Făget and Făgețel for beginners and those more advanced) as well as those who like to fish, who can try their luck in the waters of Bistricioara or the Bicaz Lake, which are near the resort.

Nearby locations include the monasteries of Moldavia (Neamț, Secu, Văratec, Agapia, Durău, Sihăstria), the Lázár Castle,[3] Lacul Roșu, the Bicaz Gorge, Lake Bicaz, the Durău resort, the Praid salt mine, Sovata, and the ceramics centre of Corund.

[7] "Borsec, Queen of Mineral Waters" (since 1806) is bottled there and exported to nations such as Hungary, Italy, Germany, France, United Kingdom, United States, Canada, Israel, South Africa, Sweden, Jordan, Greece, Lebanon, Emirates [citation needed].