Muslims made many important contributions to the field of geography from the 7th century onwards. Key Muslim geographers and their works included Al-Khwārizmī who wrote one of the earliest books on geography, Al-Masudi who compiled travel observations in his book Meadows of Gold, and Al-Idrisi who created a detailed world map and geographical encyclopedia. Ibn Majid advanced navigation and oceanography through his books on marine science and ship movements. Muslim geographers accumulated knowledge through travel, study, and the needs of pilgrimage and trade, and their works informed both Eastern and Western understanding of geography for centuries.