National Survey Authority

http://www.mod.gov.om/ar-OM/NSA

National Center for Statistical Information (NCSI)

https://www.ncsi.gov.om

ESRI (Environmental Systems Research Institute)

https://www.esri.com/en-us/home

GCC-Statistical Center

https://gccstat.org/en/

Food and Agriculture Organization (FAO)

http://www.fao.org/home/en/

ITC

https://www.itc.nl/

United Nation (US), Statistic Division

https://unstats.un.org/unsd/demographic-social/

U.S. Geological Survey

https://www.usgs.gov/

Google Earth

http://www.gosur.com/google-earth/

Google Map

https://www.google.com/maps

American Association of Geographers (AAG)

http://www.aag.org/

International Geographical Union

https://igu-online.org/

UN-Habitat - United Nations Human Settlements Programme

https://unhabitat.org/

The International Society of City and Regional Planners (ISOCARP)

https://isocarp.org/

United Nations Environment Programme

http://drustage.unep.org/

The Intergovernmental Panel on Climate Change (IPCC)

http://www.ipcc.ch/

World Bank Open Data

https://data.worldbank.org/

Royal Geographical Society

https://www.rgs.org/

IHS, Institute for Housing and Urban Development Studies

https://www.ihs.nl/en

UN  Department of Economic and Social Affairs

http://www.un.org/en/development/desa/population/