Geography

Standards
The Five Themes in Geography
https://www.worldatlas.com/the-five-themes-in-geography.html

National Geography Standards
https://www.nationalgeographic.org/standards/national-geography-standards/

Geographic Skills
https://www.nationalgeographic.org/geographic-skills/

Lessons and Activities
All Over the Map: 10 Ways to Teach About Geography
https://learning.blogs.nytimes.com/2012/12/04/all-over-the-map-10-ways-to-teach-about-geography/

13 Unexpected and Fun Geography Lessons to Enhance Your Curriculum
https://www.weareteachers.com/fun-geography-lessons/

Online Maps and General Resources
Eduplace - This site is from Houghton Mifflin Harcourt and offers a nice variety of basic outline maps in PDF form.  Free for classroom use.
http://eduplace.com/ss/maps/

Arizona Geographic Alliance - This is an outstanding site for basic and advanced outline maps.  They have continents, regions, and even an elementary section.  A few maps are meant to be printed so that a large mural map can be constructed.
http://geoalliance.asu.edu/maps

Virginia Geographic Alliance - The state geographic alliance has continued to expand its offerings to help teachers, students, and the general public better understand the study of geography.
https://php.radford.edu/~vga/

Perry-Castañeda LibraryMap Collection - The online collection at the University of Texas is a great place to look for historic maps.  Of course, they also have a wide range of contemporary maps to choose from as well.
https://legacy.lib.utexas.edu/maps/

Virginia Department of Education - There are some outline maps for Virginia's Five Regions and the geographic regions in the USI curriculum on the History and Social Science Instructional page.  Just scroll down past the chart to find the links.
http://www.doe.virginia.gov/testing/sol/standards_docs/history_socialscience/index.shtml

Florida's Educational Technology Clearinghouse - This is a collection of several thousand royalty-free maps.
http://etc.usf.edu/maps/index.htm

National Geographic
Teachers Homepage - The teaching resources section of the National Geographic website contains lessons, activities, interactive maps, and more.
https://www.nationalgeographic.org/education/teaching-resources/

Main Site - If you are simply researching a topic, looking for past articles, or want to find some great pictures, the main National Geographic is the place. 
https://www.nationalgeographic.com/

NatGeo Kids - This section is geared towards the younger set and compliments the print magazine of the same name.  It has several interactive games and interesting sites that are terrific. 
https://kids.nationalgeographic.com/