Until its union with Wallachia in 1859, the Principality of Moldavia also included, at various times in its history, the regions of Bessarabia (with the Budjak), all of Bukovina, and Hertsa; the larger part of the former is nowadays the independent state of Moldova, while the rest of it, the northern part of Bukovina, and Hertsa form territories of Ukraine.

The dog's name would have been combined with the Romanian word for water, apă, and given to the river and extended to the country.The Gothic Mulda (Gothic: 𐌼𐌿𐌻𐌳𐌰, ᛗᚢᛚᛞᚨ) meaning 'dust', 'dirt' (cognate with the English mould), referring to the river.

They are clearly distinct in dialect classifications made by Heimann Tiktin, Mozes Gaster, Gustav Weigand, Sextil Pușcariu, Sever Pop, Emil Petrovici, Romulus Todoran, Ion Coteanu, Alexandru Philippide, Iorgu Iordan, Emanuel Vasiliu, and others, whereas the other dialects have been considerably more controversial and difficult to classify.

[1] It is worth mentioning however that while on the Romanian side the vocabulary was updated with words attributed by the arrival of modern technologies of the late 20th century and merged with Wallachian and Transilvanian dialects, on the Moldavian side the language remained somehow archaic, preserving more regionalisms, becoming a "time capsule" of the way how people spoke before the annexation of the region by the Soviet Union in 1940 through the Molotov–Ribbentrop pact.

The area of the region is 46,173 km2 (17,827 sq mi) and covers 8 counties (Romanian: județ), in eastern and northeastern Romania: Bacău, Botoșani, Galați, Iași, Neamț, Suceava, Vaslui, and Vrancea.