In Psalm 139:7, the psalmist asks where he could flee from God's what?

Answer: Presence

"Where can I go to escape Your Spirit? Where can I flee from Your presence?" Psalm 139 answers: in heaven or in Sheol, You are there.

“Where can I go to escape Your Spirit? Where can I flee from Your presence? If I ascend to the heavens, You are there; if I make my bed in Sheol, You are there.”— Psalm 139:7-8 (BSB)