As a result of the expedition, he published Deutsch-Südwestafrika, Forschungsreisen durch die deutschen Schutzgebiete Groß- Nama- und Hereroland, nach dem Kunene, dem Ngamisee und Kalahari, 1884-1887 (German South West Africa: Research Expedition of Herero and Nama Country, the Kunene Region, Lake Ngami and the Kalahari- 1884-1887).
Its linguistic distribution covers a zone called Hereroland: this zone is constituted of the region of Omaheke, along with the regions of Otjozondjupa and Kunene.
b Piirainen acted during 1874–1910 as the FMS representative in Omaruru in Hereroland.
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The first missionaries of the Finnish Missionary Society arrived in Omandongo on 9 July, 1870 from Otjimbingwe in the Hereroland via Omaruru.