Trickier info, but obtainable. Distance at the ropes is another story though.
Major venues in South Africa
Durban (Kingsmead) 140 x 120m
Cape Town (Newlands) 130 x 130m
Port Elizabeth (St George's) 135 x 125m
Jo'burg (Wanderers) 150 x 125m
Centurion 145 x 125m
Bloemfontein 155 x 135m
East London 140 x 135m
Major venues in England & Wales
Lord's 155 x 130m
The Oval 145 x 140m
Edgbaston 140 x 140m
Old Trafford 135 x 135m
Headingley 140 x 140m
Trent Bridge 140 x 140m
Riverside 155 x 145m
Sophia Gardens 125 x 125m
Rose Bowl 160 x 150m
With the key exception of the Rose Bowl, which resembles a classic Australian football oval to a T, most of these grounds are either irregular fields or rectangular rather than oval, so you can imagine the listed dimensions neglect the length of the longest boundaries, at the corners. An interesting point is that the surface area of the Rose Bowl is in fact about the same as Old Trafford. You can see the straight and square boundaries are significantly shorter; the tradeoff is that midwicket/cover boundaries are much longer.