Hyperleptorrhine:
Hyperleptorrhine (very narrow) noses generally appear in cool or cold regions, or alternatively very dry regions. The smallest craniological nasal index can be found in Inuit of Arctic North America, the coldest inhabited regions of Earth. Another area of hyperleptorrhiny lies in West Asia, where some subgroups of Assyrians, Lurs, Armenians, Jews, Persians, and Arabs reach very low nasal indices. In Europe, very low nasal indices are common in three different groups: firstly some (but not all) Northwest Europeans, Gracile Mediterranean people, as well as groups of the Dinaric Alps. Hyperleptorrhiny is also found in North West India (e.g. in Sikh), as well as parts of North Africa and East Somalia.