\documentclass[tikz,border=5pt]{standalone}
\usepackage{amsmath,amssymb,amsthm,amscd,amsfonts}
\usepackage{hyperref, color}
\usepackage{tikz}
\usepackage{tikz-cd}
\begin{document}
\begin{tikzpicture}[x=0.75pt,y=0.75pt,yscale=-1,xscale=1]
\draw (258.09,148.25) .. controls (302.33,121.28) and (380.53,91.33) .. (430.95,112.3) .. controls (481.37,133.27) and (533.57,236.83) .. (495.5,291.75) .. controls (457.43,346.67) and (237.01,320.19) .. (201,281.25) .. controls (164.99,242.31) and (213.84,175.21) .. (258.09,148.25) -- cycle ;
\draw (148.5,248.4) -- (585.5,248.4) ;
\draw [shift={(588.5,248.4)}, rotate = 180] [fill={rgb, 255:red, 0;
green, 0;
blue, 0 } ][line width=0.08] [draw opacity=0] (8.93,-4.29) -- (0,0) -- (8.93,4.29) -- cycle ;
\draw (188.5,248.4) .. controls (188.5,223.22) and (208.92,202.8) .. (234.1,202.8) .. controls (259.28,202.8) and (279.7,223.22) .. (279.7,248.4) .. controls (279.7,273.59) and (259.28,294) .. (234.1,294) .. controls (208.92,294) and (188.5,273.59) .. (188.5,248.4) -- cycle ;
\draw (417.3,248.4) .. controls (417.3,223.22) and (437.72,202.8) .. (462.9,202.8) .. controls (488.08,202.8) and (508.5,223.22) .. (508.5,248.4) .. controls (508.5,273.59) and (488.08,294) .. (462.9,294) .. controls (437.72,294) and (417.3,273.59) .. (417.3,248.4) -- cycle ;
\draw [color={rgb, 255:red, 208;
green, 2;
blue, 27 } ,draw opacity=1 ] (265.34,215.59) .. controls (257.11,223.18) and (246.14,227.8) .. (234.1,227.8) .. controls (222.01,227.8) and (211,223.13) .. (202.75,215.5) ;
\draw [color={rgb, 255:red, 208;
green, 2;
blue, 27 } ,draw opacity=1 ] (494.33,215.66) .. controls (486.11,223.13) and (475.19,227.69) .. (463.2,227.69) .. controls (450.97,227.69) and (439.85,222.95) .. (431.57,215.2) ;
\draw [color={rgb, 255:red, 208;
green, 2;
blue, 27 } ,draw opacity=1 ] (265.23,215.18) -- (431.57,215.2) ;
\draw (348.5,368.4) -- (348.5,91.4) ;
\draw [shift={(348.5,88.4)}, rotate = 90] [fill={rgb, 255:red, 0;
green, 0;
blue, 0 } ][line width=0.08] [draw opacity=0] (8.93,-4.29) -- (0,0) -- (8.93,4.29) -- cycle ;
\draw (578,255) node [anchor=north west][inner sep=0.75pt] {$x$};
\draw (263.5,113.9) node [anchor=north west][inner sep=0.75pt] {$\partial \Omega $};
\draw (334,83.4) node [anchor=north west][inner sep=0.75pt] {$y$};
\draw (270.5,271.8) node [anchor=north west][inner sep=0.75pt] [font=\footnotesize] {$C_{r}^{-}$};
\draw (406.5,271.8) node [anchor=north west][inner sep=0.75pt] [font=\footnotesize] {$C_{r}^{+}$};
\draw (350.5,251.8) node [anchor=north west][inner sep=0.75pt] [font=\tiny] {$( 0,0)$};
\draw (508,250.4) node [anchor=north west][inner sep=0.75pt] [font=\tiny] {$(1,0)$};
\draw (153,250.4) node [anchor=north west][inner sep=0.75pt] [font=\tiny] {$(-1,0)$};
\draw (224,229.9) node [anchor=north west][inner sep=0.75pt] [font=\tiny,color={rgb, 255:red, 208;
green, 2;
blue, 27 } ,opacity=1 ] {$K_{t}^{-}$};
\draw (457.5,230.4) node [anchor=north west][inner sep=0.75pt] [font=\tiny,color={rgb, 255:red, 208;
green, 2;
blue, 27 } ,opacity=1 ] {$K_{t}^{+}$};
\draw (333,202.4) node [anchor=north west][inner sep=0.75pt] [font=\scriptsize,color={rgb, 255:red, 208;
green, 2;
blue, 27 } ,opacity=1 ] {$L_{t}$};
\end{tikzpicture}
\end{document}