Random lines in map (bug?) with ggmap - how to get rid of them? <p>I use ggmap (2.4) in R (RStudio 0.98) and I have a map of Myanmar with political borders in which I am plotting some linguistic information. Unfortunately the borders are displayed along with a few random lines in the same color that should not be there. One is straight in the north part, two others are further down in the south and extend into the ocean. I marked them with 2 red arrows.</p> <p>Here's my source code:</p> <pre><code>library(ggmap) burma &lt;- get_map(location=c(lon=96, lat=20), maptype='satellite', color='color', zoom=5) burma.map &lt;- ggmap(burma, darken=c(.33, 'white')) + coord_map(xlim=c(92,102), ylim=c(29,10)) + borders(database="world", colour="yellow") burma.map </code></pre> <p>The outcome is this: <a href="http://imgur.com/MgHG76g" rel="nofollow" title="Sorry, I don&#39;t have enough credits to post the picture directly.">Myanmar map with borderline syndrom</a></p> <p>Looks like a bug in the vectors for the country borders.</p>