Low-enthalpy thermal waters (30-70°C) with nitrogen as a dominant associated gas are spread within the active continental margin of the Russian Far East (east and north of the Okhotsk Sea Coast) and traditionally are of great importance for recreation and balneology facilities. The thermal waters are chemically classified into three groups: (i) Na-HCO₃(SO₃) type, with low TDS (0.2 g/L) and lowest temperature (>;50°C) and high pH (9.1-9.3), (ii) NaSO₄ type with TDS (˜1 g/L), highest temperature (70°C) and weak alkaline pH (8.7) and (iii) CaNaCl type with high TDS (15 g/L), moderate T (59°C) and neutral pH (7.5). The δ¹⁸O and δD values suggest that the thermal waters originate from meteoric water, and they are not isotopically fractionated. Silica and cation geothermometers and thermodynamic equilibrium calculations using the GeoT and PHREEQC programs indicate a reservoir temperature for the NaHCO₃ (SO₄) type thermal waters of 103-121°C and for NaSO₄ and CaNaCl types of 136 and 153°, respectively. The evaluation of the mixing degree of the thermal water with cold groundwater shows that the equilibration temperature ranges between 148 and 153°C. Estimated circulation depths for thermal manifestations range from 2.7 to 4.3 km and may be as great as 6 km.