Geography is the study of the earth's physical features, environment, and human societies. It is an extensive field that covers a range of topics, including physical geography, human geography, environmental geography, and more. The reach of geography can be understood in the following ways:

Comprehensive Reach:
Geography is a comprehensive subject that covers a range of topics, including physical features, climate, vegetation, landforms, natural resources, human societies, culture, economics, politics, and more. It provides a holistic understanding of the world we live in and how it functions.

Extensive Reach:
Geography has an extensive reach that covers the entire world. It studies the physical features of the earth, including oceans, mountains, and rivers, as well as the human societies that inhabit these regions. It helps us understand how different regions are interconnected and how they impact each other.

Numerous Applications:
Geography has numerous applications that make it an essential subject. It helps us understand the impact of climate change, natural disasters, and human activities on the environment. It also helps us make informed decisions about land use, conservation, and resource management.

Influence on Other Disciplines:
Geography has a significant influence on other disciplines, such as history, economics, sociology, and political science. It helps us understand how geography impacts human societies and how societies impact geography. It also helps us understand the historical and cultural contexts of different regions.

In conclusion, the reach of geography is extensive, and it covers a range of topics and applications. It helps us understand the world we live in and how it functions, and it has significant influence on other disciplines.