G major scale
The major scale is the foundation of a learning the neck of the guitar. There are a few different ways of organizing the major scale on the neck, but by far the most common and easiest to visualize is the CAGED Scale System. These scale forms are based around the basic open position major chords C, A, G, E and D. By using these chords shapes, you will be able to keep track of the different scale forms.
All of the notes that are circled in red are the root of the scale/chord (G)