  We have detected extremely wide (1100 km/s) CO(1-0) emission from NGC 1144,
an interacting, luminous infrared galaxy that is the dominant component of the
Arp 118 system. The observations show that NGC 1144 is one of the most CO
luminous galaxies in the local universe, with a CO luminosity twice that of Arp
220. Maps with the IRAM interferometer show that the CO is not in or very near
the Seyfert 2 nucleus, but in the 20 kpc diameter ring that extends halfway
between NGC 1144 and the elliptical galaxy NGC 1143. The greatest gas
concentration, with 40% of the CO luminosity, is in the southern part of the
ring, in NGC 1144. Another 15% of the CO luminosity comes from the dominant 10
$\mu$m source, a giant extranuclear HII region. The ring of molecular gas, the
off-center nucleus, the ring extending halfway to the intruder, and the
velocity of the intruder nearly equal to the escape velocity all show that Arp
118 is a ring galaxy produced by a collision of a massive spiral with an
elliptical. The most spectacular property is the velocity range, which in Arp
118 is 2 to 3 times higher than in a typical ring galaxy. Arp 118 is a rare
example of a very luminous extended starburst with a scale of about 5-10 kpc,
and a luminosity of 3 $\times 10^{11} L_{\odot}$.
