The "uttermost parts" are the farthest reaches of the earth, of the sea, of the morning. Scripture uses the phrase to insist that no place is too distant for God’s presence, the gospel’s reach, or even the sinner’s flight from God’s hand. "If I take the wings of the morning, and dwell in the uttermost parts of the sea; Even there shall thy hand lead me, and thy right hand shall hold me" (Psalm 139:9-10); "Yet from thence will I gather them" (Nehemiah 1:9). Christ’s ascension commission makes the missionary geography explicit: "But ye shall receive power, after that the Holy Ghost is come upon you: and ye shall be witnesses unto me both in Jerusalem, and in all Judaea, and in Samaria, and unto the uttermost part of the earth" (Acts 1:8).
The most distant or extreme parts; the farthest reaches.
UTTERMOST, adj. Extreme; in the highest, greatest, or remotest degree.
In Scripture, the phrase covers geography (the ends of the earth), eschatology (the uttermost salvation), and devotion (the uttermost love).
Psalm 139:9 — "If I take the wings of the morning, and dwell in the uttermost parts of the sea."
Acts 1:8 — "But ye shall receive power, after that the Holy Ghost is come upon you... and ye shall be witnesses unto me... unto the uttermost part of the earth."
Hebrews 7:25 — "Wherefore he is able also to save them to the uttermost that come unto God by him."
Isaiah 49:6 — "I will also give thee for a light to the Gentiles, that thou mayest be my salvation unto the end of the earth."
We hear ‘uttermost’ as a poetic flourish; Scripture means the actual ends — geographic, moral, and emotional.
Acts 1:8 is a global commission, not a local hope. The uttermost parts of the earth are an actual address — lands the disciples had never seen.
Hebrews 7:25 widens it: He saves to the uttermost. There is no sin too far gone, no soul too distant, no fall too deep, that the present priesthood of Christ cannot reach. Geography and salvation share the word.
Hebrew has a word for the farthest edge; Greek has the corresponding limit-language.
H7098 — קָצָה (qatsah) — end, extremity; the geographical edge.
Note: Greek eschatos covers both spatial extremity (Acts 1:8) and temporal (the last day).
"Acts 1:8 is a map command, not a poem."
"He saves to the uttermost; do not say a soul is past Him."
"If you fly to the uttermost parts of the sea, His right hand is there."