[4] Isthmus was recorded after O'Muineachain returned to Ireland from the Czech Republic, and was inspired by the landscape of the Erris region.

[7] The lead single "Lost Fishermen" was broadcast on KEXP,[8] An Taobh Tuathail,[9] KXCI,[10] BBC 6 Music,[11] and Açık Radyo.

[16] In their New and Notable section, the website Bandcamp wrote: "Seamus O’Muineachain takes us to his hometown of Belmullet, Ireland through patient, pensive ambient composition.

"[17] Writing for Spectrum Culture, Pat Padua said "The EP takes less than 27 minutes to tell its story, but that brief time is used to communicate the patient appreciation of a dreamlike existence on the other side of the world.

"[3] Simon Lewis of Ptolemaic Terrascope called the album "a gentle, unhurried set of songs which demand to be taken as a whole and when done so prove to be a balm for the soul.