ᡤᠣᠯᠮᡳᠨ (golmin, “long”) + ᡠᠯᠠ (ula, “river”). Calque of Chinese 長江/长江 (Cháng Jiāng, “Yangtze”, literally “long river”).
ᡤᠣᠯᠮᡳᠨᡠᠯᠠ • (golmin ula)