Context : The Origem Loop in the Galactic anticentre was discovered in 1970s and suggested to be a large supernova remnant .
It was argued later to be a chance superposition of unrelated radio sources .

Aims : We attempt to understand the properties of the Origem Loop .

Methods : Available multi-frequency radio data were used for the determination of radio spectra of different parts of the Origem Loop and the polarization properties of the loop .

Results : Newly available sensitive observations show that the Origem Loop is a loop of more than 6 \degr in diameter .
It consists of a large non-thermal arc in the north , which we call the Origem Arc , and several known thermal H II regions in the south .
Polarized radio emission associated with the arc was detected at \lambda 6 cm , revealing tangential magnetic fields .
The arc has a brightness temperature spectral index of \beta = -2.70 , indicating its non-thermal nature as a supernova remnant .
We estimate the distance to the Origem Arc to be about 1.7 kpc , similar to those of some H II regions in the southern part of the loop .

Conclusions : The Origem Loop is a visible loop in the sky , which consists of a supernova remnant arc in the north and H II regions in the south .